How Username Availability Checks Answer in Milliseconds
What happens between typing a username and seeing “already taken”? Build and benchmark a real availability-check system using canonical keys...
Oct 17, 2026
18 min
I built my own Redis clone in Python to understand how it works
I used Redis for years without knowing what happens after I type SET. So I built a small clone in Python: it speaks the Redis wire protocol,...
Oct 6, 2026
10 min
Stop Logging Out Innocent Users: Building Production Refresh Token Rotation with Token Family Revocation in Redis
Naive refresh token rotation causes race conditions that randomly log out legitimate users across multiple tabs. Learn how to architect atom...
Oct 2, 2026
12 min
Caching Strategies Every Backend Developer Must Know
A practical, code-first guide to cache-aside, read-through, write-through, write-behind, and refresh-ahead patterns — with Redis examples, e...
Aug 19, 2026
12 min
Event-Driven Microservices with Apache Kafka, Redis Caching and Transactional Outbox Pattern
Master high-throughput event-driven microservices architecture using Java 21, Spring Boot 3.4+, Apache Kafka, Redis distributed locking and ...
Aug 16, 2026
3 min
We Added Redis to Make Things Faster. It Made Things Worse.
We added Redis to fix a slow endpoint and watched response times drop. Then came stale data, invalidation problems, traffic spikes, and data...
Jul 30, 2026
7 min
Rate Limiting Alone Won't Stop a Patient Attacker
IP-based throttling and account-based lockout solve different problems and neither substitutes for the other. Built and tested in NestJS: th...
Jul 2, 2026
6 min
Background Jobs in NestJS with BullMQ: A Complete Walkthrough
A from-scratch background job pipeline in NestJS using BullMQ and Redis, demonstrated on an async LLM draft-generation endpoint — covering r...
Jul 1, 2026
10 min
JWT Authentication Done Right: The 2026 Security Playbook
Most JWT implementations have at least one critical security flaw. Algorithm confusion, token theft via XSS, missing expiry validation, impr...
Jun 11, 2026
12 min